A polyhedron is said to be regular when all its faces are identical regular polygons There are nine regular polyhedra the five Platonic solids seen...
{"Image ImageDescription": "UNKNOWN - AUGUST 21:  A polyhedron is said to be regular when all its faces are identical regular polygons. There are nine regular polyhedra; the five Platonic solids, seen at the top of the picture, known to the Greeks and named after the philosopher Plato: the two star polyhedra discovered by Kepler; and the two described by Poinsot in 1810.  (Photo by SSPL/Getty Images)", "Image Copyright": "SSPL/Science Museum"}